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Journal Article

Prospects for improving the sensitivity of the cryogenic gravitational wave detector KAGRA


Wei,  Li-Wei
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Michimura, Y., Komori, K., Enomoto, Y., Nagano, K., Nishizawa, A., Hirose, E., et al. (2020). Prospects for improving the sensitivity of the cryogenic gravitational wave detector KAGRA. Physical Review D, 102(2): 022008. doi:10.1103/PhysRevD.102.022008.

Cite as: http://hdl.handle.net/21.11116/0000-0006-B492-9
Upgrades to improve the sensitivity of gravitational wave detectors enable more frequent detections and more precise source parameter estimation. Unlike other advanced interferometric detectors such as Advanced LIGO and Advanced Virgo, KAGRA requires different approach for the upgrade since it is the only detector which employs cryogenic cooling of the test masses. In this paper, we describe possible KAGRA upgrades with technologies focusing on different detector bands, and compare the impacts on the detection of compact binary coalescences. We show that either fivefold improvement in $100 M_{\odot}$--$100 M_{\odot}$ binary black hole range, a factor of 1.3 improvement in binary neutron star range, or a factor of 1.7 improvement in the sky localization of binary neutron stars is well feasible with upgrades which do not require changes in the existing cryogenic or vacuum infrastructure. We also show that twofold broadband sensitivity improvement is possible by applying multiple upgrades to the detector.